Circuit Tester Kit

Circuit Tester Kit

Item # 40376

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Draw-Tite Wiring - 40376
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  • Tools for Wiring
  • Testers
  • Circuit Tester
  • Draw-Tite
Circuit Tester Kit Lowest Prices for the best wiring from Draw-Tite. Circuit Tester Kit part number 40376 can be ordered online at etrailer.com or call 800-298-8924 for expert service.


  • All Info
  • Reviews (17)
  • Q & A (3028)
  • Videos (2)
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  • Why etrailer?

Draw-Tite Wiring - 40376

Circuit Tester Kit


Features:

  • Heavy-duty tester signals with a light and a buzzer
  • Tests low voltage up to 28 volts
  • Finds electrical shorts
  • Checks circuits from a distance
  • Checks polarity
  • Checks battery drain
  • Kit includes:
    • Alligator clip
    • Hook


40376 Circuit Tester Kit






California residents: click here


Video of Circuit Tester Kit


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Circuit Testing a Vehicle 4-Pole

Today Im going to show you how to test the functionality of a trailer four-way connectors. What youre going to need to do this is a circuit tester and a buddy in the drivers seat to operate the taillight functions. The first thing were going to test is the taillights themselves. Hit the taillights. (beeping) that means thats working. The next thing were going to test is the left blinker.

(beeping) That works. Then were going to test the brake light function on that side as well. So, hit the brakes. (beeping) That works. Then for the right blinker (beeping).

Now the right brake (beeping). Now we know that this four-way connector is functioning.


Customer Reviews

Circuit Tester Kit - 40376

Average Customer Rating:  5.0 out of 5 stars   (17 Customer Reviews)

Circuit Tester Kit

- 40376
by:

Ordered several electrical connectors,wire and a wire tester .. all items came in good condition ,looking forward to using the tester as soon as I can I am sure it will do the job. 359795



- 40376
by:

This is my second Lisle circuit tester. I purchased to replace a unit I lost. These are very well made and worth the extra spend. The Customer Service from e-trailer is second to none and I'm a repeat customer due to the help these folks will render. 228513


Comments

Still works well and is still in great shape. Thanks for asking.

Scott P - 09/29/2016

21328

- 40376
by:

Well made, clear instructions and very useful for sorting out trailer wires. If you have several trailers and multiple towing vehicles this is real handy! 413164



- 40376
by:

Purchased this to troubleshoot existing truck wiring and wiring I installed. Much more convenient than using my volt-ohm meter (VOM). 585992



- 40376
by:

Excellent service and attention to detail. I would highly recommend purchasing from etrailer. Prices are great and they have a wide selection of information that helps with the purchase decision. Very impressed. 551374



- 40376
by:

Excellent quality circuit tester. Can check battery drainage and troubleshoot wiring shorts. 498087



- 40376
by:

worked great for the purpose check wiring on trailer 422465



- 40376
by:

Great product 376271


Comments

Great product

Kej263 - 05/04/2018

38106

- 40376
by:

I have placed several orders with e-trailer over time and keep returning. I have gotten ffast response on questions and all orders have been filled correctly an on time. 274120



- 40376
by:

Looks good 235043



- 40376
by:

This circuit tester was worth every penny. The audio and light indicators took all the guesswork out of the wiring. It made it easy to identify turn signal and brake wires and I was able to test for proper functionality in my trailer contact once everything was installed. Highly recommended. 180242



- 40376
by:

This really is the ultimate circuit tester! The audible feature is a huge benefit when working alone and energizing a circuit remotely.... saved me multiple trips between truck cab and trailer tail lights! When working on trailer light circuits, this is a must have tool! 84638



- 40376
by:

This tester is well made and definitely worth the money. Makes troubleshooting wiring problems a breeze. 84363



- 40376
by:

High quality equipment! Thanks etrailer.com for the excellent service. 66038



- 40376
by:

Product were just explained. always a great job. i enjoy doing business with etrailer. 64106



- 40376
by:

Very nice tester. Heavier duty than the cheap ones you buy at local retail stores. I like the fact that it also has the audible tone along with the light. 33136



- 40376
by:

Great tester 31427


17
17

Ask the Experts about this Draw-Tite Wiring
Do you have a question about this Wiring?


  • Hooking a Gooseneck Trailer with RV 7-Way Plug to 1999 International 9100 7-Way Round Plug
  • The first thing that you need is the Pollak Trailer Connector Adapter # PK12-724 which converts the 7-Way round connector on your 1999 International 9100 to a 7-Way blade style connector. This will plug into your 9100 and provide a pace to connect the gooseneck trailer wiring. The next step is to then use the Roadmaster Brite-Lite Wiring Converter # RM-732 on your trailer side wiring right behind the 7-Way. This converter takes separate brake and turn signals and combines them so that...
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  • Adding a 7-Way Trailer Connector to a 2016 Ford Explorer without Factory Tow Package
  • The T-connector trailer wiring harness # 118540 will plug into a 2016 Ford Explorer that doesn't have the factory tow package but all of the functions may not work; specifically the 12 volt circuit, trailer brake circuit, and reverse light circuit. To see if these functions work on your Explorer you can use a circuit tester such as # 40376 or a meter if you have one and test the pins on the harness where the T-connector would plug in. If there is no constant 12 volt circuit then you...
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  • Trailer Hitch and Wiring for a 2017 GMC Acadia
  • I think I have forgotten more about hitches than Amazon will ever know! Draw-Tite trailer hitch # 76023 and Curt trailer hitch # C13293 will both fit your 2017 GMC Acadia. I have linked a video showing an example installation of the Draw-Tite hitch on a 2017 Acadia for you. The trailer wiring harnesses that are available all fit models that came with the factory tow package. If you take a look at the video I have linked on # 118720 you will see where it plugs in on the vehicle. That...
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  • Installation of Tekonsha T-One Wiring Harness on a 2017 Ford Escape
  • While we have not had the opportunity to install this wiring kit on a 2017 Ford Escape, I do have the installation instructions, which I've attached, that will show and tell you exactly what is needed to install the Draw-Tite wiring harness # 118715 to your 2017 Ford Escape. The # 118715 is a confirmed fit for your 2017 Ford Escape. You will need a trim panel remover like # ALL648544 to remove the panels. You will also need 8mm socket and ratchet or 8mm Wrench, Drill (3/32” Drill Bit)...
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  • Wiring Instructions for the Curt Soft Trac Charger
  • You are correct that the Red wire from the Charger for Curt Soft Trac I and II Trailer Breakaway Kits # C52025 is connected to the Battery, the White is connected to Ground, the Blue is connected to the Breakaway Switch. The Black wire that you are asking about will be spliced into the 12V Power wire on your trailer. This should be the wire connected to the pin in the 11 O'clock position on your trailer's 7-Way connector (see attached picture). You can test this out by connecting your trailer...
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  • Installing a Brake Controller on a 2007 GMC Savana Van
  • A brake controller will have to be hardwired into your 2007 GMC Savana. If your van came with a factory installed 7-Way trailer connector then the brake output wire should already be ran back to the 7-Way. It terminates under the dash near the emergency brake pedal. It should be a blue wire. The remaining wires will have to be hardwired in. White grounds to the negative battery terminal. Black goes to the positive battery terminal via a 30 amp circuit breaker. And red goes to the cold...
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  • Wiring Harness Recommendation For A 2004 Ford Escape
  • The Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector part # 119178 is not ran directly to the vehicle's battery. There are 5 wires that you will need to connect in order to install this harness. The white wire is for the ground circuit. The brown wire is for the tail lights. The yellow wire is responsible for the left turn signal. The red wire is responsible for the stop lights and the green wire is for the right turn signal. You will attach each of these...
    view full answer...

  • Prodigy P3 Brake Controller Installation in 2018 Jeep JL Wrangler without Tow Package
  • Brake controllers like the excellent Prodigy P3 # 90195 use the vehicle brake light switch to deliver the electrical signal that tells the controller your vehicle is braking, and from there the built-in accelerometer sensor determines the amount of braking power that needs to be sent to the trailer's brakes. This is how all proportional type brake controllers operate. They take in the triggering electrical signal from the pedal and then proportionally deliver brake power to match the rate...
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  • Installing Trailer Brake Controller on 2018 GMC Canyon
  • On the Tekonsha Prodigy P3 Brake Controller # 90195 (great choice) the black wire is for 12V power, the blue wire is for brake output to the 7-Way connector, the red wire is for brake switch on the vehicle, and the white wire is for ground. Based on my research the following connections will be made with the wires you found behind the kick panel of your GMC Canyon: Black wire on brake controller to red wire in vehicle Blue wire on brake controller to light blue wire on vehicle Red...
    view full answer...

  • Recommended Replacement Electric Brakes for 7,000 lb Tandem Axles
  • For a pair of 7,000 lb tandem axles I recommend the Dexter Nev-R-Adjust Electric Trailer Brake Kit # 23-464-465. These brakes are 12" diameter x 2" wide and will work with your 5 bolt mounting flange and 16" wheels. These brake assemblies are rated specifically for use with 7,000 lb axles instead of some brakes which can work with axles that have a wide range of capacity, such as between 5,200 lbs and 7,000 lbs. The only thing you need in addition to these brakes is Mounting Bolts...
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  • Brake Controller for an RV Built on a 2016 Ford E-450 Van Chassis
  • As far as I know the factory integrated Ford brake controller cannot be installed on the E-Series van chassis because it was not designed or set up for it. But that isn't a bad thing for you because the factory controllers are not nearly as effective as an aftermarket controller can be. And the price is usually much lower. Since 2014 was the last year the E-Series vans were available to the public brake controller manufacturers can no longer test them to confirm if a brake controller...
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  • How To Determine If 2003 Toyota Highlander Has The Factory Tow Package
  • if your 2003 Toyota Highlander has a tow package plug located in the driver's side rear cargo area under the floor (see instructions for installing Item # 118413 on where to look) then your Highlander has the tow package. If you find a plug, use a circuit tester like Item # 40376 to check to see if it is active. If you do not find a plug or the one you find is not active then you do not have a tow package. Another way to find out is to contact your local Toyota dealer, give them...
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  • Recommended Brake Controller for a 2017 Porsche Macan
  • I do have a brake controller that will work well with your 2017 Porsche Macan but the Tekonsha Prodigy RF Wireless Trailer Brake Controller part # 90250 is not a confirmed fit. Instead, I recommend using the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 as this is one of our most highly rated, well reviewed, and easy to use brake controllers. If you do not have the factory tow package on your Macan then you will also need to install the Universal Installation Kit for Trailer...
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  • Adding a 7-Way and Brake Controller to a 2012 Ford Van with Factory Tow Package Connectors
  • Trailer wiring harness # 118261 will certainly plug into the connectors you found at the back of your 2012 Ford Van and the 7-Way connector pictured is included. However, if the van did not come with a factory 7-Way then it is possible that some or all of the circuits are not active on the factory harness. You can use a circuit tester such as # 40376 to test the vehicle side connectors to see if they have power when the various lighting functions are used. There may also be 1 pin that has...
    view full answer...

  • Adding 7-Way and 4-Way to 2017 Toyota Tacoma Without Tow Package
  • The reason the 7-Pole and 4-Pole Trailer Connector Sockets # HM40975-11998 has more wires than the 4-pin is because this part is used for a 7-way and 4-way. We can help accomplish your goal but first you would first need to add 4-way # 118685. From there you will need # 5506, which is similar to the # ETBC7, to get the functions of the 7-way and you can then hardwire # HM40975-11998 to get the look you want. There is no video for how to accomplish specifically what you want to do, so...
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  • Curt Trailer Wiring Harness Does Not have Power on a 2016 Honda Odyssey
  • There are a couple of things to check with the installation of Curt trailer wiring harness # C56378 on your 2016 Honda Odyssey. First, make sure the fuse is installed in the red power wire. If it is installed make sure that the fuse is good and replace if needed. Also make sure that the white ground wire is attached to a bare metal surface. Next check that the second fuse is installed in the proper location and that it is not blown and move/replace if needed. According to the instructions:...
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  • Installing a Towed Vehicle Battery Switched Charging Line on 2016 Ford F53 Chassis Motorhome
  • For your 2016 Coachmen Mirada 35LS, to find a switched power line I recommend using a circuit tester like # 40376. Then you will use the Roadmaster Battery Charge Line Kit for Motorhomes # RM-156-75 with solenoid # TR118665 after the circuit breaker with the center post connected to your switched power line. This with make sure that power is only drawn from the motorhome when the ignition switch of your Coachmen is turned on. Then on the towed vehicle (toad) side you can use the Roadmaster...
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  • 2018 Wrangler JL 5-Way Trailer Wiring Harness
  • We certainly do. The solution is basically to convert a 4-way to a 5-way. If your 2018 Jeep JL already has a 4-way then you simply need to convert it. If it doesn't already have any trailer wiring then you need to start with a custom 4-way harness. The Tekonsha, part # 118786, has the highest maximum amperage available for the wiring that fits your Jeep so it's what I'd choose. It plugs inline behind both tail lights and then has a hot lead that's run to the Jeep's battery. I've...
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  • Installing an Electric Brake Controller in a 2018 Chevrolet Traverse with a Factory 7-Way Connector
  • The Electric Brake Controller Adapter, part # 3026-P, is confirmed to fit the 2018 Chevrolet Traverse Limited. If you have a Limited model you should have the connector underneath your dashboard. Since you don't have the connector under your dash instead of using the # 3026-P adapter you need our # 5506 wiring kit to install the Prodigy P3, part # 90195. The wiring kit includes everything to power a brake controller. I've linked a video from when we installed our # ETBC7 kit on...
    view full answer...

  • Troubleshooting Trailer Lights not Working After Harness Install
  • There are a number of steps for you to take to figure out exactly why the lights on your trailer are not working. You did not specify the harness you used, but for a 2007 Honda Odyssey, there are three fits, the T-One # 118438, Curt # C56161, and Hopkins # HM11143115. To start, we'll isolate the problem to either the trailer or vehicle. You can do this by using a circuit tester such as # 40376 to check the functions of the 4-way plug while somebody else engages them (brake, turn signal,...
    view full answer...

  • Recommended Brake Controller for a 2018 Volkswagen Atlas
  • For a brake controller that will work well with your 2018 Volkswagen Atlas, I recommend taking a look at the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195. The Tekonsha P3 is one of our best selling brake controllers due to its built in safeguards and ease of use. Unfortunately, a plug and play brake controller wiring harness is not available for your Atlas at this time therefore, the only way to install the controller would be to hardwire it directly to your vehicle's wiring...
    view full answer...

  • Adding a Brake Controller to a 2017 Ford Explorer XLT with Factory Tow Package
  • If your trailer has electric brakes then I highly recommend using a brake controller to decrease stopping distances when towing and to reduce wear and tear on the 2017 Ford Explorer's brakes. Your Explorer with tow package should include a 7-Way trailer connector which is needed for electric brakes. But also check the glove box for a Ford brake controller harness which they may or may not have included. If you do have the factory brake controller harness then the amount of installation...
    view full answer...

  • Trailer Hitch and Wiring Recommendations for a 2013 Ford Explorer Police Interceptor
  • First, we have had reports that Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" Item # 76034 does fit the 2013 Ford Explorer Police Interceptor model. When adding a 4-Way trailer connector, # HM40285, to the Explorer it does require a direct connection to the vehicle battery so it does have a powered converter. But your Explorer might be factory prewired for a trailer connector. Check under the vehicle for the factory wiring as shown in the video I have linked...
    view full answer...

  • Replacing Factory Brake Controller on 2018 Toyota Tundra
  • The problems you are having with the factory brake controller on your 2018 Toyota Tundra, as you mentioned, are not too uncommon. This is really the case with most factory brake controllers regardless of the truck make or model, as many customers choose to replace it with an aftermarket unit as soon as they get a chance. Before doing so I do recommend talking with a local Toyota dealer to see if anything needs to be done after unplugging the factory unit as it's possible the computer...
    view full answer...

  • 7-Way Connector and Fusion LED Trailer Lights Functions by Wire Color
  • I can tell you which wires on each the light and plug are for, though you will want to use a circuit tester such as # 40376 to verify the functions. The the Fusion LED Trailer Tail Light # STL211XRFHB has a 4-wire pigtail. The white wire is ground, brown wire is backup light, red wire is brake light and black wire is tail light. The Epicord 7-Way Molded Trailer Plug # 277-000143 is a 7-way connector that has the same functions as you see in the accompanying diagram. The yellow wire...
    view full answer...


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Info for this part was:

Expert Research:
Michael L
Video Edited:
Zack K
Video Edited:
Andrew K
Expert Research:
Robert G
Expert Research:
Patrick B
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Expert Research:
Jeffrey L
Photos by:
Zach O
Updated by:
Sarah W
Updated by:
Alexander C

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